Hello,
I tried both with the version that comes installed in the latest version of XAMPP, which is 10.4.32 of MariaDB, and with previous versions of XAMPP from between 1 and 2 years ago (I do not remember the versions of MariaDB from that one, but I would say they were 10.2.x), as well as with the version 10.6.17 updated by myself.
I also tried with different PHP versions, such as 7.4.27, 8.1.2, 8.2.12 or 8.3.6.
But well, as I said you can easily reproduce the error by downloading the latest version of XAMPP for Windows, adjust the php.ini parameters to meet the requirements of Helix Ultimate and the installation will fail. Then, if you try to do a new installation by disabling the “display_errors” parameter the installation completes without errors, obviously as a previous step you have to recreate again the database and copy again the original HelixUltimate files in the htdocs/xxxxxx folder.